Small improvements

Author: eduard13

app/code/Magento/Review/Model/Review/Config.php

@@ -15,7 +15,7 @@
  */
 class Config
 {
-    const XML_PATH_WISHLIST_ACTIVE = 'catalog/review/active';
+    const XML_PATH_REVIEW_ACTIVE = 'catalog/review/active';
 
     /**
      * @var ScopeConfigInterface
@@ -39,7 +39,7 @@ public function __construct(
     public function isEnabled(): bool
     {
         return $this->scopeConfig->isSetFlag(
-            self::XML_PATH_WISHLIST_ACTIVE,
+            self::XML_PATH_REVIEW_ACTIVE,
             ScopeInterface::SCOPE_STORES
         );
     }

app/code/Magento/ReviewGraphQl/Model/Resolver/Product/Review/AverageRating.php

@@ -64,9 +64,9 @@ public function resolve(
         /** @var Review $review */
         $review = $value['model'];
         $summary = $this->ratingFactory->create()->getReviewSummary($review->getId());
-        $averageRating = $summary->getSum();
+        $averageRating = $summary->getSum() ?: 0;
 
-        if ($summary->getSum() > 0) {
+        if ($averageRating > 0) {
             $averageRating = (float) number_format($summary->getSum() / $summary->getCount() / 20, 2);
         }